[Lowfer] Using Argo

[Bob]

On the R-75, CW-R is the same as USB (the User Manual is incorrect) so 
tuning up in freq causes the signal to go down on the display and as we 
are not chasing signals it is somewhat irrelevant.
With SpecLab that effect is overcome by using a negative offset value.

I seem to recall that both Wolf and Alberto advising against using 
filtering of the signal, the filtering is done within the software, 
provided the correct bandwidth is setup.

Bob  VK7ZL



On 5/12/2012 22:20, Douglas D. Williams wrote:
> Well, I see no reason why your method of using SSB USB mode would not work
> with the R-75.
>
> I have encountered a few situations, however, where narrow filters helped
> my QRSS reception. One example for me is the 185.300 kHz USA Lowfer
> "watering hole". I have a strong PLC very close to this frequency, so close
> that it is within the passband of my R-75's narrowest CW filter (250 Hz). I
> notice a distinct improvement in QRSS reception resolution on this
> frequency, using ARGO, when I use my Winradio SDR and set the filter width
> to 150 Hz or less. So yes, at least for me, there are times when it is
> advantageous to use a narrow filter (I.F. audio, or software defined)
> filter before sending the data on to Argo (or Spectran or Spectrum Lab) for
> QRSS decoding.
>
> LF is different that 30 meters.
>
> 73, Doug KB4OER
>
>
>
>
> On Wed, Dec 5, 2012 at 3:49 AM, Bob <vk7zl at internode.on.net> wrote:
>
>> Thanks for the replies but I can see no valid reason for using either CW
>> or CWR mode and there is no advantage in using the narrow CW filters.
>> I use Argo and SpecLab and in both cases I use USB and tune 1KHz below the
>> centre freq. of the display.
>> For 30M I tune 1300Hz below which allows me to run WSPR and QRSS at the
>> same time.
>>
>> Bob  VK7ZL
>>
>>
>>
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-- 
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